accessory thyroid tissue

accessory thyroid tissue

an isolated mass of tissue that arises from the developing thyroid gland and appears in the tongue or thymus gland.

ac·ces·so·ry thy·roid tis·sue

(ak-sesŏr-ē thīroyd tishū)
Isolated mass of tissue that arises from the developing thyroid gland and appears in the tongue or the thymus gland.
References in periodicals archive ?
Even when there is normal development of the thyroid glands, there may be accessory thyroid tissue in the region of the neck at any point along the original track of the thyroid gland or beyond it in the mediastinal space or on rare occasion in the tracheal wall.
No accessory thyroid arteries were present, and no accessory thyroid tissue was found.
reveal that although the exact pathogenesis of this ectopic, accessory thyroid tissue is not known, it generally originates from epithelial tissue of non-obliterated thyroglossal duct.